Altera Avalon Tri-State Conduit Components Instrukcja Użytkownika Pobierz pdf (Strona 16)

3–4 Chapter 3: Tri-State Conduit Pin Sharer

Hierarchical Pin Sharing

Avalon Tri-State Conduit Components User Guide May 2011 Altera Corporation

Preliminary

Hierarchical Pin Sharing

Figure 1–1 on page 1–1 provides the simplest use of the Tri-State Conduit Pin Sharer;

it multiplexes between two controllers. You can also create a design that includes

hierarchy of Tri-State Conduit Pin Sharers that access the same pins on the FPGA. In

Figure 3–5, Sub-systems A and B each include two controllers that access off-chip

devices. The pin sharer in the Top Level system connects to a single Tri-State Conduit

Bridge that drives signals on the PCB.

Figure 3–5. Using The Tri-State Conduit Pin Sharer in Hierarchical Designs

Tri-state

Conduit

Pin Sharer

TCS

request

grant

Tri-state

Controller 1

TCM

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Tri-state

Controller 2

TCM

Tri-state

Controller 3

TCM

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grant

request

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addr

write

read

data

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Tri-state

Controller 4

TCM

Tri-state

Conduit

Pin Sharer

TCS

TCM

Tri-state

Conduit

Pin Sharer

TCS

TCM

Tri-state

Conduit

Bridge

Device 1

Device 2

Device 3

Device 4

TCS

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Altera FPGA

Sub-system A

Sub-system B

Top Level

PCB

1 2 ... 11 12 13 14 15 16 17 18

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